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delta=49-40=9
pierw. z delta=3
iloczynowa: y=a(x-x1)(x-x2)
x1=(7-3)/2=2
x2=(7+3)/2=5
odp.
y=(x-2)(x-5)
kanonicza: y=a(x-p)^2+q
p=-(-7)/2=7/2
q=-9/4
odp.
y=(x - 7/2)^2 - 9/4